FWIW, I didn't think to check the stem yet, but I got blindsided a few weeks ago by a road grinding operation that left a 3" square ledge going perpendicular to the travel direction that was not marked and was obscured by parallel tree shadows when I encountered it on my ride home after riding the same route in the morning prior to the grinding operation. Of course, the discontinuity was at the bottom of a hill so I was going about 25mph when I struck it. Both wheels were knocked out of position but fortunately no taco or blowout, however, there was immediately a lot of brake drag from the out of position wheels so I ground to a stop and checked the damage. The rear wheel was intact, and just needed to be put back in proper alignment. The front wheel was warped axially, but fortunately only a little, and I was able to gain sufficient brake clearance by opening the brake cam, and re-aligning the wheel, thus able to continue my ride home. However, I immediately noticed, riding on the drops, as is my wont, that the handlebar had assumed a new, deeper shape, and narrower at the drops into the bargain. Did I mention I ride the drops? That was my configuration when I struck the discontinuity. So a large percentage of my mass was shock loaded onto the drops on the impact. Now I need to check the stem.
BTW, the front rim, on inspection, is toast. It has a nice radial divot of 2-3mm rendering the 2-3 spokes in the area ridiculously loose. I will rebuild the wheel with a new rim. I'm amazed I didn't get a pinch flat (700c x 25 tire/tube).